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6.6.1.1
Permissive Underreach Transfer Trip with Pick-up (PUTT)
Principle
Sequence
7SA6 Manual
C53000-G1176-C156-2
2101
FCT Telep. Dis.
ON
„1"
OFF
>Dis.Telep.OFF
>Dis.Telep. ON
System port: Dis.Telep.OFF
System port: Dis.Telep.ON
Figure 6-49
Switching on and off of the teleprotection
The following procedure is suited for conventional transmission media.
Figure 6-50 shows the operation scheme of the permissive underreach transfer trip
scheme. In the case of a fault inside zone Z1, the transfer trip signal is sent to the op-
posite line end. The signal received at that end causes the tripping if the corresponding
protection function picked up. The transmitted signal may be prolonged by T
ble in address 2103A Send Prolong. ), to compensate for possible differences in
the pick-up times at the two line ends. The distance protection is set in such a way that
the first zone reaches up to approximately 85 % of the line length. In three-end lines
Z1 is also set to approx. 85 % of the shorter line section, at least, however, up to the
T-point.
The overreach zone Z1B is not relevant for this signal transmission scheme, but it can
be controlled by the automatic reclosure (see also Subsection 6.14.1).
PICKUP(A)
A
PICKUP(B)
Z1
(A)
T1
PU
&
(A)
further
zones
Figure 6-50
Operation scheme of the permissive underreach transfer trip method via pickup
Figure 6-51 shows the logic diagram of the permissive underreach transfer trip
scheme for one line end.
≥1
S
R
S
R
Z1(B)
T
S
transm.
≥1
trip
rec.
Dis Telep. off
Z1(A)
B
PICKUP(A)
PICKUP(B)
T
S
transm.
T1
≥1
&
trip
rec.
Functions
(setta-
S
Z1
(B)
PU
(B)
further
zones
6-91
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